| quick | (adjective) moving quickly and lightly | Synonyms: agile, nimble, spry |
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| (adjective) easily aroused or excited | Synonyms: warm |
| (adjective) accomplished rapidly and without delay | Synonyms: speedy |
| (adjective) hurried and brief | Synonyms: fast, flying |
| (adjective) apprehending and responding with speed and sensitivity | Synonyms: ready |
| (adjective) performed with little or no delay | Synonyms: immediate, prompt, straightaway |
| quickset | (adjective) grown from cuttings planted directly in the ground | - |
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| quicksilver | (adjective) liable to sudden unpredictable change | Synonyms: erratic, fickle, mercurial |
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| quiescent | (adjective) being quiet or still or inactive | - |
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| (adjective) (pathology) causing no symptoms | - |
| (adjective) not active or activated | - |
| (adjective) marked by a state of tranquil repose | - |
| quiet | (adjective) free of noise or uproar; or making little if any sound | - |
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| (adjective) characterized by an absence or near absence of agitation or activity | - |
| (adjective) (of the sun) characterized by a low level of surface phenomena, such as sunspots | - |
| (adjective) (of a body of water) free from disturbance by heavy waves | Synonyms: placid, smooth, still, tranquil, unruffled |
| (adjective) in a softened tone | Synonyms: hushed, muted, subdued |
| (adjective) not showy or obtrusive | Synonyms: restrained |
| quilted | (adjective) made of layers of fabric held together by patterned stitching | - |
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| quincentenary | (adjective) of or relating to a 500th anniversary | Synonyms: quincentennial |
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| quincentennial | (adjective) of or relating to a 500th anniversary | Synonyms: quincentenary |
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| quinquefoliate | (adjective) (of a leaf shape) having five leaflets | - |
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| quintessential | (adjective) representing the perfect example of a class or quality | - |
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| quintillionth | (adjective) the ordinal number of one quintillion in counting order | - |
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| quintuple | (adjective) having five units or components | Synonyms: five-fold, fivefold |
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| quirky | (adjective) (informal) strikingly unconventional | Synonyms: far-out, kinky, offbeat, way-out |
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| quits | (adjective) on equal terms by payment or requital | - |
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| quixotic | (adjective) not sensible about practical matters; idealistic and unrealistic | Synonyms: romantic, wild-eyed |
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| quizzical | (adjective) perplexed (as if being expected to know something that you do not know) | Synonyms: questioning |
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| (adjective) playfully vexing (especially by ridicule) | Synonyms: mocking, teasing |